Update fmt package to 9.1.0 (#683)

Author: apivovarov

cmake/configs/default.cmake

@@ -282,7 +282,7 @@ hunter_default_version(filament VERSION 1.9.8)
 hunter_default_version(fixesproto VERSION 5.0)
 hunter_default_version(flatbuffers VERSION 2.0.0)
 hunter_default_version(flex VERSION 2.6.4)
-hunter_default_version(fmt VERSION 8.1.1)
+hunter_default_version(fmt VERSION 9.1.0)
 hunter_default_version(folly VERSION 2018.10.22.00-p4)
 hunter_default_version(freetype VERSION 2.10.4-p0)
 hunter_default_version(freetype-gl VERSION 0.0.0-1a8c007-p0)

cmake/projects/fmt/hunter.cmake

@@ -129,6 +129,17 @@ hunter_add_version(
     9577d6de8f4e268690b099976810ade9ebef5fb5
 )
 
+hunter_add_version(
+    PACKAGE_NAME
+    fmt
+    VERSION
+    "9.1.0"
+    URL
+    "https://github.com/fmtlib/fmt/archive/9.1.0.tar.gz"
+    SHA1
+    6c0db60f3fa7bd4cf58edc777a2408e0ddfb28b9
+)
+
 hunter_cmake_args(
     fmt
     CMAKE_ARGS

examples/fmt/fmtexample.cpp

@@ -1,11 +1,11 @@
-#include <fmt/format.h>
-#include <fmt/core.h>
+#include <fmt/format.h> // The full format API. Lightweight subset of formatting functions is fmt/core.h
 
 int main() {
   fmt::print("Hello world\nThis is fmt(ex-cppformat)\n");
   std::string as_string = fmt::format("The answer is {}", 42);
-  fmt::memory_buffer buf;
-  format_to(buf, "{}\nThe previous line and this message were bufferred in memory", as_string);
-  fmt::print(stderr, "{}\nAnd then were printed to stderr\n", buf.data());
+  auto buf = fmt::memory_buffer();
+  fmt::format_to(std::back_inserter(buf), "{}\nThe previous line and this message were bufferred in memory", as_string);
+  // We can not use buf.data() directly. To convert buffer to string use fmt::to_string(buf). It uses buf.size() to determine correct string size!!!
+  fmt::print(stderr, "{}\nAnd then were printed to stderr\n", fmt::to_string(buf));
   fmt::print("Fmt supports many nice features, see {url} for details\n", fmt::arg("url", "https://github.com/fmtlib/fmt"));
 }